Rankine to Kelvin Converter

Temperature Converter

5 units available

Decimals:

From

To

0.555556

1 °R = 0.555556 K

Formula:

K = °R × 5/9

With your value: 1 °R = 0.55555556 K

Other Rankine to Kelvin conversions

2 °R to K 3 °R to K 4 °R to K 5 °R to K 6 °R to K 7 °R to K 8 °R to K

Rankine to Kelvin Conversion Table

Rankine (°R)	Kelvin (K)
0.5	0.277778
1	0.555556
2	1.111111
5	2.777778
10	5.555556
15	8.333333
20	11.111111
25	13.888889
50	27.777778
100	55.555556
250	138.888889
500	277.777778
1000	555.555556

Kelvin to Rankine Conversion Table

Kelvin (K)	Rankine (°R)
0.5	0.9
1	1.8
2	3.6
5	9
10	18
15	27
20	36
25	45
50	90
100	180
250	450
500	900
1000	1,800

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Rankine (°R)

Temperature

SI definition

Traceable to the kelvin, defined by fixing the Boltzmann constant at 1.380 649 × 10⁻²³ J/K. Celsius and Fahrenheit are exact affine transforms of the kelvin scale.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

Kelvin (K)

Temperature

SI definition

Traceable to the kelvin, defined by fixing the Boltzmann constant at 1.380 649 × 10⁻²³ J/K. Celsius and Fahrenheit are exact affine transforms of the kelvin scale.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

How to Convert Rankine to Kelvin

To convert from Rankine (°R) to Kelvin (K), multiply the value by 0.5555555556.

Formula: K = °R × 5/9

Reverse: °R = K × 9/5

Step-by-Step Example

Start with your value in Rankine. For example: 5 °R
Multiply by the conversion factor: 5 x 0.5555555556
The result is: 2.777778 K

About Rankine

The Rankine scale is an absolute temperature scale using Fahrenheit-sized degrees: 0 °R is absolute zero and water freezes at 491.67 °R.

Common uses: US thermodynamics, combustion engineering.

About Kelvin

The Kelvin scale is the SI unit of temperature that starts at absolute zero (−273.15°C). It is used extensively in scientific research.

Fun Fact: At 0 Kelvin (absolute zero), all molecular motion stops. It has never been fully achieved in a laboratory.

Common uses: physics, astronomy, chemistry.

Frequently Asked Questions

How many Kelvin are in 1 Rankine?

There are exactly 0.5555555556 Kelvin in 1 Rankine. This means the conversion factor from Rankine to Kelvin is 0.5555555556.

What is the formula to convert Rankine to Kelvin?

The formula to convert Rankine to Kelvin is: K = °R × 5/9. For example, to convert 10 Rankine to Kelvin, you would multiply 10 by 0.5555555556.

What is a Rankine?